Energy-Efficient Power Allocation with Rate Proportional Fairness Constraint in Non-Orthogonal Multiple Access Systems

Zheng-qiang WANG  Chen-chen WEN  Zi-fu FAN  Xiao-yu WAN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A   No.4   pp.734-737
Publication Date: 2018/04/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E101.A.734
Type of Manuscript: LETTER
Category: Communication Theory and Signals
non-orthogonal multiple access (NOMA),  power allocation,  rate proportional fairness,  fractional programming,  

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In this letter, we consider the power allocation scheme with rate proportional fairness to maximize energy efficiency in the downlink the non-orthogonal multiple access (NOMA) systems. The optimization problem of energy efficiency is a non-convex optimization problem, and the fractional programming is used to transform the original problem into a series of optimization sub-problems. A two-layer iterative algorithm is proposed to solve these sub-problems, in which power allocation with the fixed energy efficiency is achieved in the inner layer, and the optimal energy efficiency of the system is obtained by the bisection method in the outer layer. Simulation results show the effectiveness of the proposed algorithm.